[jira] [Created] (GROOVY-9984) Wrong type inference when passing null

[Stefanos Chaliasos (Jira)]

Stefanos Chaliasos created GROOVY-9984:
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             Summary: Wrong type inference when passing null
                 Key: GROOVY-9984
                 URL: https://issues.apache.org/jira/browse/GROOVY-9984
             Project: Groovy
          Issue Type: Bug
            Reporter: Stefanos Chaliasos


I have the following Groovy program.
{code:groovy}
@groovy.transform.CompileStatic
public class Main {
  public static void main(String[] args) {
    final A<Integer> x = new A<>(null);
    baz(x);
  }

  public static void baz(A<Integer> x) {}

}

class A<T> {
  T f;
  public A(T f) {
    this.f = f;
  }
}

{code}
h2. Actual Behavior

The program does not compile, and I get the following error.
{code:java}
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
Test.groovy: 4: [Static type checking] - Incompatible generic argument types. 
Cannot assign A <java.lang.Object> to: A <Integer>
 @ line 4, column 26.
       final A<Integer> x = new A<>(null);
                            ^

Test.groovy: 5: [Static type checking] - Cannot call Main#baz(A 
<java.lang.Integer>) with arguments [A <java.lang.Object>]
 @ line 5, column 5.
       baz(x);
       ^

2 errors

{code}
h2. Expected Behavior

Compile successfully.
h2. Comment

This should be a regression bug because it compiles with the 4.0.0-alpha-2 
compiler.

h2. Affected Version

This programs fails when compiled with the compiler from the master (commit: 
f0eea862549529ef4e93fafe337f86dd4ac98751).



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